Common designs include multi-ball and U-shaped rollers and dual-texture rolling points. Some handheld units offer interchangeable attachment heads such as Round, Acupressure, Roller, Wavy, and Stone.
You can find manual (nonpowered) rollers, plug-in electric models, battery-powered units, and rechargeable designs, including Type-C rechargeable handheld massagers.
Some models include heating and vibration; others provide adjustable percussion with various attachments; and a few rollers are designed to be chilled for cold therapy.
Some units include default auto-shutoff timers (for example, a 15-minute timer) and standard product warnings such as 'Adult Use Only' to help prevent overuse.
Many foot and calf massagers include zippered foot sleeves that detach and are machine-washable to keep the unit hygienic.